<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.bootcss.com/angular.js/1.4.6/angular.min.js"></script> 
</head>
<body>

<div ng-app="" ng-init="firstName='John'">

<p>姓名为 <span ng-bind="firstName"></span></p>

</div>

</body>
</html>